Pressure sensor

Abstract

The invention relates to a pressure sensor, and relates to the technical field of pressure sensors, the pressure sensor comprises a housing, a viscous flow member and a pressure measurement assembly, the housing is internally provided with an installation cavity and a pressure introduction channel, and the pressure introduction channel longitudinally extends and communicates with the installation cavity and is used for introducing a to-be-measured pressure medium into the installation cavity; the stagnant flow piece is fixed to one end of the inner side of the pressure introduction channel in a sealed mode, a stagnant flow channel extending transversely is defined in the stagnant flow piece, and one end of the stagnant flow channel communicates with the pressure introduction channel; the pressure measuring assembly is fixed in the installation cavity, a pressure cavity is defined by the pressure measuring assembly, the viscous flow piece and the shell, the pressure measuring assembly comprises a pressure sensitive element communicated to the pressure introduction channel, and the other end of the viscous flow channel is communicated to the pressure sensitive element. According to the invention, the to-be-measured pressure medium can be prevented from directly and vertically impacting the pressure sensitive element, the pressure sensitive element is protected, and the pressure sensitive element is prevented from being damaged.

Description

Technical Field

[0001] The present application relates to the technical field of pressure sensors, and in particular to a pressure sensor. Background Art

[0002] A pressure sensor is a device that can convert a pressure signal into a measurable electrical signal. It is widely used in various industrial and scientific research fields to monitor and control pressure. The pressure sensor can detect the pressure exerted on the sensor by gas, liquid or solid, and convert it into an electrical signal output such as voltage, current or frequency. According to different test pressure types, pressure sensors can be divided into gauge pressure sensors, differential pressure sensors and absolute pressure sensors.

[0003] The pressure sensor includes a shell enclosing an installation cavity. The pressure medium to be measured can enter the installation cavity through a longitudinally extending pressure introduction channel. A pressure sensitive element is arranged in the installation cavity. The pressure of the pressure medium to be measured is measured through the pressure sensitive element.

[0004] However, when the pressure medium to be measured enters the installation cavity through the pressure introduction channel, the pressure pulse formed by the vertical flow of the pressure medium to be measured directly acts on the pressure sensitive element, causing impact on the pressure measurement component and causing damage to the pressure sensitive element. Summary of the invention

[0005] The purpose of the present application is to provide a pressure sensor that can prevent the pressure medium to be measured from directly vertically impacting a pressure sensitive element, thereby protecting the pressure sensitive element and avoiding damage to the pressure sensitive element.

[0006] In a first aspect, a pressure sensor provided by the present application adopts the following technical solution:

[0007] A pressure sensor comprises a housing, a flow-stopping member and a pressure measuring assembly, wherein a mounting cavity and a pressure introduction channel are arranged in the housing, the pressure introduction channel extends longitudinally and is connected to the mounting cavity, and is used to introduce a pressure medium to be measured into the mounting cavity;

[0008] The stagnation piece is sealed and fixed to one end of the inner side of the pressure introduction channel, and the stagnation piece is surrounded by a stagnation channel extending laterally, and one end of the stagnation channel is connected to the pressure introduction channel;

[0009] The pressure measuring assembly is fixed in the installation cavity and forms a pressure cavity with the stagnant flow member and the housing. The pressure measuring assembly includes a pressure sensitive element connected to the pressure introduction channel, and the other end of the stagnant flow channel is connected to the pressure sensitive element.

[0010] By adopting the above technical solution, the pressure medium to be measured enters the stagnation member from the pressure introduction channel. Under the guidance of the laterally extending stagnation channel, the pressure pulse formed by the pressure medium to be measured is well suppressed, thereby preventing the pressure measurement component from being damaged by a strong impact.

[0011] Optionally, one inner end of the pressure introduction channel is expanded to form a concave cavity, a first glue is provided in the concave cavity, the flow-retarding member is at least partially located in the concave cavity, and the flow-retarding member is fixed and sealed to the concave cavity by the first glue.

[0012] By adopting the above technical solution and providing the first glue, the concave cavity can better constrain the stagnation member and the pressure measurement component.

[0013] Optionally, the stagnant flow member includes an upper seat and a lower seat which are combined up and down, and the stagnant flow channel is formed by the upper seat and the lower seat.

[0014] By adopting the above technical solution, the upper seat and the lower seat are combined to form a stagnant flow channel, and the detachable setting of the stagnant flow member makes the processing and forming of the stagnant flow channel simpler and more convenient.

[0015] Optionally, one of the upper seat and the lower seat is recessed inwardly to form a step surface, and the other is protruded outwardly to form a supporting flange, and the supporting flange cooperates to press against the inner wall of the step surface.

[0016] By adopting the above technical solution, the setting of the support flange can prevent glue from penetrating into the stagnant flow channel to avoid clogging of the stagnant flow channel. At the same time, the setting of the step surface and the support flange can also make the upper seat and the lower seat fit together more closely.

[0017] Optionally, the measuring component also includes a substrate, a processing circuit arranged on the upper surface of the substrate and a first frame fixed at one end to the lower side of the substrate, the other end of the first frame extends into the cavity and is fixed and sealed to the shell by a first glue.

[0018] By adopting the above technical solution and providing a first surrounding frame, the cavity is sealed to prevent the pressure medium to be measured from leaking out of the cavity.

[0019] Optionally, the pressure sensitive element is disposed on the lower surface of the substrate and is electrically connected to a pad disposed on the lower surface of the substrate through a lead, and the pad is electrically connected to the processing circuit;

[0020] The pressure measurement assembly also includes a second frame fixed to the lower surface of the substrate and surrounding the pressure sensitive element and the lead wires. The second frame is located inside the first frame and is filled with a protective gel covering the pressure sensitive element and the lead wires.

[0021] By adopting the above technical solution, the pressure sensitive element is surrounded by the second surrounding frame, so that when the protective gel is applied, the protective gel can better cover the pressure sensitive element and the lead.

[0022] Optionally, the first surrounding frame is integrally connected to the second surrounding frame.

[0023] By adopting the above technical solution, the first enclosure frame and the second enclosure frame are integrally arranged, so as to facilitate production and processing and ensure the connection strength between the substrate and the first enclosure frame and the second enclosure frame.

[0024] Optionally, the stagnant flow channel extends in a winding manner along the transverse direction.

[0025] By adopting the above technical solution, the meandering stagnation channel can further reduce the impact force of the pressure medium to be measured and protect the pressure measurement component.

[0026] Optionally, it also includes a temperature sensitive element arranged in the pressure introduction channel away from the inner end, and the stagnation piece is molded with a terminal, and the temperature sensitive element is connected to the pressure measurement component through the terminal.

[0027] By adopting the above technical solution, the temperature sensitive element can measure the temperature of the pressure medium to be measured and monitor the temperature of the pressure medium to be measured.

[0028] Optionally, the flow-blocking member is provided with a retaining portion extending into the pressure introduction channel and used for retaining the temperature sensitive element.

[0029] By adopting the above technical solution, the holding portion can better hold the temperature sensitive element on the holding portion.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] 1. The present application is provided with a stagnation member with a stagnation channel, and the pressure medium to be measured enters the stagnation member from the pressure introduction channel. Under the guidance of the transversely extending stagnation channel, the pressure pulse formed by the pressure medium to be measured is well suppressed, thereby preventing the pressure measurement component from being damaged by a strong impact.

[0032] 2. The stagnation member in the present application is detachable, including an upper seat and a lower seat. The stagnation channel is formed by the upper seat and the lower seat, making the processing and forming of the stagnation channel simpler and more convenient. At the same time, the setting of the support flange on the upper seat or the lower seat can prevent glue from penetrating into the stagnation channel to avoid blockage of the stagnation channel.

[0033] 3. In the present application, the first glue is provided to fix and seal the flow-retarding member to the inner end of the pressure introduction channel, so that the first surrounding frame and the outer shell are fixedly sealed. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic cross-sectional structural diagram of the pressure sensor in Example 1 of the present application;

[0035] Figure 2 yes Figure 1 A partial enlarged schematic diagram of part A;

[0036] Figure 3 is a top view of the lower seat in Example 1 of the present application;

[0037] Figure 4 is a partial structural diagram of another form of the pressure sensor in Example 1 of the present application;

[0038] Figure 5 is a schematic diagram of a partial structure of a pressure sensor in Example 2 of the present application;

[0039] Figure 6 It is a partial structural diagram of another form of the pressure sensor in Example 2 of the present application.

[0040] In the figure, 1, shell; 11, installation cavity; 12, pressure introduction channel; 13, concave cavity; 14, pressure cavity; 15, pressure interface; 16, terminal; 161, through hole; 2, stagnant part; 21, stagnant channel; 22, upper seat; 221, support flange; 222, clamping column; 23, lower seat; 231, step surface; 24, retaining part; 25, first glue receiving part; 26, second glue receiving part; 3, pressure measurement component; 31, pressure sensitive element; 32, substrate; 321, pressure via; 33, processing circuit; 34, first enclosure; 35, second enclosure; 4, first glue; 5, protective gel; 6, temperature sensitive element; 7, second glue; 8, first gap; 9, second gap; 10, terminal. DETAILED DESCRIPTION

[0041] The following will be combined with the attached Figure 1-6 The technical solution of the present application is described clearly and completely. The following embodiments are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application. In the following description, the same symbols are used to represent the same or equivalent elements, and repeated descriptions are omitted.

[0042] In the description of the present application, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the present application are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0043] In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] It should be further understood that the term “and / or” used in the specification and corresponding claims of this application refers to any and all possible combinations of one or more of the listed items.

[0045] Embodiment 1:

[0046] A pressure sensor, referring to Figure 1 and Figure 2 , including a housing 1. An installation cavity 11 and a pressure introduction channel 12 are provided in the housing 1. Specifically, the housing 1 includes a terminal button 16 and a pressure interface 15 combined in an upper and lower manner, and the terminal button 16 and the pressure interface 15 enclose the above-mentioned installation cavity 11; the pressure introduction channel 12 can be vertically opened on the pressure interface 15, and an inner end of the pressure introduction channel 12 (i.e., the upper end shown in the figure) is connected to the installation cavity 11, so that the pressure medium to be measured is introduced into the installation cavity 11.

[0047] Correspondingly, a pressure measuring assembly 3 is provided in the installation cavity 11. The pressure measuring assembly 3 includes at least one pressure sensitive element 31. The pressure measuring assembly 3 may also include a substrate 32, a processing circuit 33 provided on the upper surface of the substrate 32 and connected to the pressure introduction channel 12. Among them, a pad (not shown) is provided on the lower surface of the substrate 32. The pressure sensitive element 31 is located on the lower surface of the substrate 32; the pressure sensitive element 31 is electrically connected to the above-mentioned pad through a lead (not shown), and the pad can be electrically connected to the processing circuit 33 through a conductive structure provided on the substrate 32.

[0048] When the pressure sensitive element 31 contacts the pressure medium to be measured, the pressure sensitive element 31 senses the pressure of the pressure medium to be measured to form an electrical signal (for example, piezoelectric effect, capacitance value, resistance value change), and the electrical signal can be transmitted to an external device after being processed by the processing circuit 33.

[0049] Specifically, a through hole 161 is provided on the terminal 16, and a terminal 10 in the form of a pin or a spring is provided in the through hole 161. One end of the pin or spring terminal is electrically connected to the processing circuit 33 in a contact manner, and the other end of the pin or spring terminal vertically passes through the through hole 161 upward, thereby transmitting the processed electrical signal to the external device.

[0050] In the prior art, when the pressure medium to be measured is injected into the installation cavity 11 in a vertically upward direction through the pressure introduction channel 12, the pressure medium to be measured has a large impact force, which impacts the pressure sensitive element 31, thereby damaging the pressure sensitive element 31.

[0051] In order to avoid damage to the pressure sensitive element 31, refer to Figure 2 , a stagnation member 2 is sealed and fixed at one end of the inner side of the pressure introduction channel 12. The substrate 32, the stagnation member 2, and the housing 1 form a pressure chamber 14, and the pressure chamber 14 is located in the installation chamber 11 to accommodate the pressure medium to be measured. A stagnation channel 21 extending laterally on a horizontal plane is provided in the stagnation member 2; one end of the stagnation channel 21 is connected to the pressure introduction channel 12, and the other end of the stagnation channel 21 is connected to the pressure sensitive element 31.

[0052] When the pressure medium to be measured enters the stagnant flow channel 21 from the pressure introduction channel 12, the flow direction of the pressure medium to be measured changes, that is, the flow direction of the pressure medium to be measured changes from the vertical flow direction to the horizontal flow direction. When the flow direction changes, the pressure pulse formed by the pressure medium to be measured during the flow acts on the stagnant flow member 2, thereby blocking the pressure shock to a certain extent, thereby protecting the pressure sensitive element 31.

[0053] Reference Figure 2 The outlet of the stagnant flow channel 21 is staggered with the pressure sensitive element 31 in the vertical direction. Such an arrangement can ensure that the impact formed by the pressure medium to be measured does not directly face the pressure sensitive element 31 just after entering the pressure chamber 14 from the outlet.

[0054] Furthermore, in this embodiment, the stagnant flow channel 21 may extend in a winding manner along the lateral direction. In some other solutions, the stagnant flow channel 21 may extend along a straight line, which may also play a certain stagnant role.

[0055] Combination Figure 3 In one specific embodiment, the stagnant flow channel 21 can extend in a zigzag manner along the transverse direction, for example, it can extend in a certain direction along the transverse direction, and then extend in the opposite direction, forming a 180-degree turn. The above-mentioned turn can be repeated multiple times. When the pressure medium to be measured enters the stagnant flow channel 21, the pressure medium to be measured flows in a zigzag manner in this direction, thereby further suppressing the pressure pulse formed by the pressure medium to be measured when flowing.

[0056] Correspondingly, the stagnant member 2 can be composed of a plurality of components. For example, the stagnant member 2 includes an upper seat 22 and a lower seat 23 which are combined in an upper and lower manner; the stagnant channel 21 is surrounded by the upper seat 22 and the lower seat 23, and the joint surface of the upper seat 22 and the lower seat 23 divides the stagnant channel 21 into two parts along its axis, thereby facilitating the processing and forming of the stagnant channel 21. During processing, the corresponding parts of the stagnant channel can be processed on the upper seat 22 and the lower seat 23 respectively.

[0057] It should be noted that in this embodiment, the shapes of the upper seat 22 and the lower seat 23 are not specifically limited, and their cross-sectional shapes may be rectangular, circular, or any other suitable shapes.

[0058] Further, refer to Figure 2 and Figure 3 One end of the inner side of the pressure introduction channel 12 is expanded to form a concave cavity 13, and a first glue 4 is arranged in the concave cavity 13; the stagnant member 2 is at least partially located in the concave cavity 13, and the stagnant member 2 is fixed in the concave cavity 13 by the first glue 4 and the corresponding end of the stagnant channel 21 is sealedly connected to the upper end of the pressure introduction channel 12.

[0059] When the flow-blocking member 2 is sealed and fixed to one end of the inner side of the pressure introduction channel 12, the upper seat 22 and the lower seat 23 are first preliminarily assembled together, for example, they can be assembled together by tight fit. A positioning structure can be provided between the upper seat 22 and the lower seat 23, for example, a clamping column (not shown) can be provided on one (preferably the upper seat 22), and a clamping hole 232 that is connected to the clamping column can be provided on the other. Then, the lower seat 23 is directed toward the concave cavity 13, and the flow-blocking member 2 is installed in the concave cavity 13 to achieve preliminary fixation of the flow-blocking member 2.

[0060] At this time, the first glue 4 is injected into the concave cavity 13 to complete the sealing and fixing action. In some other schemes, the upper seat 22 can be positioned on the lower seat 23, and then the upper seat 22 and the lower seat 23 are bonded together by the first glue 4. Therefore, the edge of the joint surface of the upper seat 22 and the lower seat 23 needs to be at least partially immersed in the first glue 4.

[0061] Further, refer to Figure 1 and Figure 2 Preferably, the upper seat 22 can protrude downward to form a circle of support flanges 221 surrounding the stagnant channel 21, which is buckled downward on a circle of step surfaces 231 formed on the lower seat 23. Through this structure, when the filling height of the first glue 4 is controlled to be above the lower edge of the support flange 221 but lower than the stagnant channel 21, the first glue 4 can be effectively prevented from entering the stagnant channel 21 and blocking the stagnant channel 21.

[0062] In addition, a first glue receiving portion 25 for accommodating the first glue 4 is formed at the connecting edge of the upper seat 22 and the lower seat 23, and a plurality of first glue receiving portions 25 are provided, and the plurality of first glue receiving portions 25 surround the circumference of the stagnation member 2. The first glue 4 injected into the concave cavity 13 can make the edges of the upper seat 22 and the lower seat 23 bonded together, and the first glue 4 can enter the first glue receiving portion 25, so that the stagnation member 2 can be more firmly fixed in the concave cavity 13.

[0063] Furthermore, a second glue receiving portion 26 for receiving the first glue 4 is formed between the lower seat 23 and the pressure interface 15 , so that the lower seat 23 can be reliably fixed to the pressure interface 15 .

[0064] The substrate 32 can be sealed and bonded to the upper end surface of the pressure interface 15 by the second glue 7 to close the upper end of the cavity 13. Figure 2 Preferably, the pressure measurement assembly 3 may further include a first enclosure 34 whose upper end is bonded to the lower side of the substrate 32. After the first glue 4 is injected into the concave cavity 13, the other end of the first enclosure 34 is extended into the concave cavity 13, so that the pressure measurement assembly 3 and the pressure interface 15 are fixed and sealed by the first glue 4. At this time, since the first enclosure 34 has been fixed to the substrate 32, the substrate 32 does not need to be fixed to the upper end surface of the pressure interface 15.

[0065] Correspondingly, a step surface 231 is provided on the pressure interface 15 or the substrate 32. In one specific embodiment, the step surface 231 can be provided on the pressure interface 15. In another specific embodiment, the step surface 231 can also be provided on the lower surface of the substrate 32. The step surface 231 is used to accommodate the second glue 7, so that the pressure measurement component 3 is further fixed to the pressure interface 15.

[0066] Reference Figure 2 In some other solutions, preferably, the pressure measurement assembly 3 may further include a second enclosure 35 fixed to the lower surface of the substrate 32 and surrounding the pressure sensitive element 31 and the lead wires. The second enclosure 35 is located inside the first enclosure 34, and the second enclosure 35 may be filled with a protective gel 5 covering the pressure sensitive element 31 and the lead wires.

[0067] Before installing the pressure measurement assembly 3 into the installation cavity 11, first invert the pressure measurement assembly 3 so that the side of the substrate 32 with the second enclosure 35 is vertically facing upward. At this time, the protective gel 5 is injected into the second enclosure 35 until it covers the pressure sensitive element 31 and the lead wires. The protective gel 5 forms a protective layer after solidification. When the pressure measurement assembly 3 is fixed and sealed in the housing, the protective layer protects the pressure sensitive element 31.

[0068] Preferably, the first enclosure 34 can be integrally connected with the second enclosure 35. In this way, the first enclosure 34 and the second enclosure 35 can be fixed to the lower side of the base plate 32 together, and the base plate 32 and the first enclosure 34 and the second enclosure 35 have a higher connection strength.

[0069] In addition, refer to Figure 4 In other embodiments, the pressure sensitive element 31 may be disposed on the upper side of the substrate 32 instead of on the lower side of the substrate 32. A pressure through hole 321 is provided on the substrate 32, and the pressure sensitive element 31 blocks the upper end of the pressure through hole 321. At this time, the pressure sensitive element 31 is connected to the stagnant flow channel 21 through the pressure through hole 321 and the concave cavity 13. The pressure can be transmitted to the pressure sensitive element 31 through the substrate 32, so that the effect of monitoring the pressure can also be achieved. At this time, the second frame 35 can be cancelled.

[0070] It should be noted that when the pressure sensitive element 31 is disposed on the lower surface of the substrate 32, it is possible to choose to open a pressure through hole 321 on the substrate 32 or not. Furthermore, when a pressure through hole 321 is opened on the substrate 32, the pressure sensitive element 31 can also be disposed in the pressure through hole 321 to block the pressure through hole 321. Both methods can achieve the effect of pressure detection of the pressure medium to be tested.

[0071] The present application changes the flow direction of the pressure medium to be measured by setting a stagnant flow channel 21. When the pressure medium to be measured enters the stagnant flow channel 21, the flow direction of the pressure medium to be measured changes from vertical flow to horizontal winding flow. When the flow direction changes, the pressure pulse formed by the flow velocity of the pressure medium to be measured acts on the wall of the stagnant flow channel 21, and the pressure pulse is suppressed, thereby preventing the pressure sensitive element 31 from being damaged by the pulse formed by the pressure medium to be measured when measuring pressure, and playing a better protective role for the pressure sensitive element 31. It is easy to understand that the above-mentioned "stagnant flow channel 21" can also be other suitable shapes such as spiral shape, as long as it can effectively block the flow of fluid in fluid mechanics, that is, it can form a certain pressure head loss to the fluid through the extended shape of the stagnant flow channel 21.

[0072] Embodiment 2:

[0073] Reference Figure 5 and Figure 6 The difference between this embodiment and the embodiment 1 is that the pressure sensor further includes a temperature sensitive element 6 disposed in the pressure introduction channel 12 away from the inner end. The stagnation member 2 may be molded with a plurality of terminals connected to the temperature sensitive element, and the temperature sensitive element 6 is electrically connected to the pressure measurement assembly 3 through the terminals, thereby detecting the temperature of the pressure medium to be measured.

[0074] Correspondingly, the flow-blocking member 2 is provided with a holding portion 24 extending into the pressure introduction channel 12 and used to hold the temperature sensitive element 6. Figure 5 In this embodiment, the retaining portion 24 is clamped in the pressure introduction channel 12, and a first gap 8 is left between the outer wall of the retaining portion 24 and the pressure introduction channel 12 to allow the pressure medium to be measured to pass through.

[0075] In addition, refer to Figure 6 In other embodiments, the holding portion 24 may also be configured as a tube. The temperature sensitive element 6 is held inside the holding portion 24, and a second gap 9 is left between the inside of the holding portion 24 and the temperature sensitive element 6 to allow the pressure medium to be measured to pass through.

[0076] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pressure sensor, It is characterized in that include: A housing (1) is provided with a mounting cavity (11) and a pressure introduction channel (12) therein, wherein the pressure introduction channel (12) extends longitudinally and is connected to the mounting cavity (11) and is used to introduce a pressure medium to be measured into the mounting cavity (11); A flow-retaining member (2) is sealed and fixed to one end of the inner side of the pressure introduction channel (12), wherein the flow-retaining member (2) encloses a transversely extending flow-retaining channel (21), and one end of the flow-retaining channel (21) is connected to the pressure introduction channel (12); and a pressure measuring assembly (3) fixed in the installation cavity (11) and forming a pressure cavity (14) together with the stagnant flow member (2) and the housing (1), wherein the pressure measuring assembly (3) comprises a pressure sensitive element (31) connected to the pressure introduction channel (12), and the other end of the stagnant flow channel (21) is connected to the pressure sensitive element (31).

2. A pressure sensor according to claim 1, It is characterized in that One inner end of the pressure introduction channel (12) is enlarged to form a concave cavity (13), a first glue (4) is arranged in the concave cavity (13), the flow-retarding member (2) is at least partially located in the concave cavity (13), and the flow-retarding member (2) is fixed and sealed to the concave cavity (13) by the first glue (4).

3. A pressure sensor according to claim 2, It is characterized in that The stagnant flow member (2) comprises an upper seat (22) and a lower seat (23) which are combined in an upper and lower manner, and the stagnant flow channel (21) is formed by enclosing the upper seat (22) and the lower seat (23).

4. A pressure sensor according to claim 3, It is characterized in that One of the upper seat (22) and the lower seat (23) is recessed inward to form a step surface (231), and the other is protruded outward to form a support flange (221), and the support flange (221) is tightly pressed against the inner wall of the step surface (231).

5. A pressure sensor according to claim 2, It is characterized in that The measuring component further comprises a substrate (32), a processing circuit (33) arranged on the upper surface of the substrate (32), and a first enclosure (34) having one end fixed to the lower side of the substrate (32); the other end of the first enclosure (34) extends into the concave cavity (13) and is fixedly sealed to the housing (1) by the first glue (4).

6. A pressure sensor according to claim 5, It is characterized in that The pressure sensitive element (31) is arranged on the lower surface of the substrate (32) and is electrically connected to a pad arranged on the lower surface of the substrate (32) through a lead wire, and the pad is electrically connected to the processing circuit (33); The pressure measurement assembly (3) further comprises a second enclosure (35) fixed to the lower surface of the substrate (32) and surrounding the pressure sensitive element (31) and the lead wire, wherein the second enclosure (35) is located inside the first enclosure (34), and the second enclosure (35) is filled with a protective gel (5) covering the pressure sensitive element (31) and the lead wire.

7. A pressure sensor according to claim 5, It is characterized in that The first surrounding frame (34) and the second surrounding frame (35) are integrally connected.

8. A pressure sensor according to any one of claims 1 to 7, It is characterized in that The stagnant flow channel (21) extends in a winding manner along the transverse direction.

9. A pressure sensor according to claim 1, It is characterized in that It also includes a temperature sensitive element (6) arranged in the pressure introduction channel (12) away from the inner end, and the stagnation element (2) is molded with a terminal, and the temperature sensitive element (6) is connected to the pressure measurement component (3) through the terminal.

10. A pressure sensor according to claim 9, It is characterized in that The flow-blocking member (2) is provided with a retaining portion (24) extending into the pressure introduction channel (12) and used for retaining the temperature sensitive element (6).

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